the best thing to do is take it to the dealer. Trust me.
you will have to replace the window regulator.
You buy a service,repair manual or you take it to a shop
If the rear window on your 1998 Jeep Grand Cherokee Laredo will not open, you might have a failed window motor or actuator. You could also have a fuse that is blown or an issue with the window wiring.
In the fuse box.
pls see... http://www.faqfarm.com/Q/What_is_wrong_when_the_front_passenger_power_window_motor_sounds_like_it%27s_going_to_work_but_then_stops_and_the_window_will_not_move_on_a_1999_Jeep_Grand_Cherokee
Ed McCahill has written: 'Chilton's Jeep Grand Cherokee 2005-09 repair manual' -- subject(s): Cherokee automobile, Jeep automobile, Maintenance and repair, Handbooks, manuals 'Jeep Grand Cherokee automotive repair manual' -- subject(s): Cherokee automobile, Jeep automobile, Maintenance and repair, Handbooks, manuals
The only differences are between a regular Cherokee and a Grand Cherokee.
I've included a link below in related links that will show you a YouTube video on How To fix the window regulator for your 99 Jeep Grand Cherokee.
Dealer Warranty item.